#include <REGX52.H>
#include <INTRINS.H>

void Delay500ms()		//@11.0592MHz
{
	unsigned char i, j, k;

	_nop_();
	i = 4;
	j = 129;
	k = 119;
	do
	{
		do
		{
			while (--k);
		} while (--j);
	} while (--i);
}



int main()
{
	while(1)
	{
		P2 = 0xFE;// 1111 1110
		Delay500ms();
		P2 = 0xFD;// 1111 1101 
		Delay500ms();
		P2 = 0xFB;// 1111 1011
		Delay500ms();
		P2 = 0xF7;// 1111 0111
		Delay500ms();
		P2 = 0xEF;// 1110 1111
		Delay500ms();
		P2 = 0xDF;// 1101 1111
		Delay500ms();
		P2 = 0xBF;// 1011 1111
		Delay500ms();
		P2 = 0x7F;// 0111 1111
		Delay500ms();
	}
}